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Finding the Fourth Proportional to 186.61, 279.90 and 64.87

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Solution

The fourth proportional to 186.61, 279.90 and 64.87 is: 97.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.61 : 279.90 = 64.87 : x
  2. Step 2: Convert to fraction form
    186.61/279.90 = 64.87/x
  3. Step 3: Cross multiply
    186.61x = 279.90 × 64.87
  4. Step 4: Simplify right side
    186.61x = 18,155.39
  5. Step 5: Solve for x
    x = 18,155.39/186.61
  6. Step 6: Final answer
    x = 97.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.